When you spin quickly, you may feel dizzy. Which component of the inner ear generates the sensations that can lead to this feeling?
A) spiral organ
B) maculae
C) otoliths
D) semicircular canals
E) ossicles
D
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Which of the following is a connective tissue sheath that surrounds an individual muscle fiber?
A. Epimysium B. Fascia C. Tendon D. Endomysium E. Perimysium
A group of rats are bred in a laboratory to study muscle function. This group possesses a genetic defect that causes troponin to be incorrectly synthesized, making it non-functional. Because of this, the rats are entirely paralyzed. Which of the following correctly explains the impact of the defect on the muscle?
A. Troponin, when revealed by tropomyosin, won't be able to bind to the myosin heads of the thick filament. B. Troponin won't pull away to reveal the actin binding spots of the thin filament after tropomyosin binds Ca+2. C. Troponin, when revealed by actin, won't be able to bind to the myosin heads of the thick filament. D. Troponin can't bind Ca+2, which stops tropomyosin from pulling away to reveal actin binding spots on the thin filament.
Structures in the head are innervated by the sympathetic division by postganglionic fibers originating in (the)
A) superior mesenteric ganglion. B) inferior cervical ganglion. C) inferior mesenteric ganglion. D) superior cervical ganglion. E) None of the answers are correct.
Hemophilia A is
A) a defect in the clotting mechanism. B) more common in females. C) passed from affected males to their sons. D) due to an X-linked dominant gene.